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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc5f24fc5020a9e55dc128993b219c078a2ae5e47ace612527a1ffd77ad7cf75' 
  AND token = '+aefY7Qf85fY3PtCIoKtPX7p4snKDeb0dKl8Q1Qsp84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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