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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff62b517bc2d33d28f58e9e8e78d502958f521aba9f28fb357efcf04b78fb249' 
  AND token = 'K38U5P1bQhN9cGtqLIBcPn4LyOPyqalMEJJPAzroxZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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