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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1930e998fa59310b2a2219ebcf69b0f785c1893587b61055c840fe19b539ca9b' 
  AND token = 'X7WCD1e6+HXPPxpSeWjL4O1lHMhj9qU+e7j5zlh0Z/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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