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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9194ee94a9f8d3840096804849b8f701c520f80197c424059285debdc328fa44' 
  AND token = 'buxptQ6O51TN4ZD6GEtXnR1S7sOh2YUqGkLOkM9ETQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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