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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e275831d1d75145bcfe4a67b5fe9522ee5d0572604fbf6674760f2d1479af0c0' 
  AND token = 'zIP9C6Ha5xIL4AJhmdM+OaoJId3XOomlriYdkrJ8Pbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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