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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5ed98f9425f102b6ef9e551166fd8a0427550db5ff4c09764bf8a65dc05bc3f' 
  AND token = 'yWyNLlaRUlO+Ja7ppG2/9dSiDxQdLxx3RdmWcs4Vs4w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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