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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e1f9e384dff673a11bef9c2e4ed552f5f5987b46be110dc42863e599fdae74' 
  AND token = 'NZf8yikRSfthjMB5BkLViGzLllT3f9rTg/o7niwDiEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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