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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e34c4d9ef6eb28ac59b1d3647739788b947307a9c4b3e1a324fcb7eca217ac71' 
  AND token = 'YIrUSb2AiAi5L6JPedX6bV3V280cM0liWe+yEESDuUM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}