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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '244b52731e4bd3e019fcf2a107c743c600772e7be36492c490ae3528be9db2ce' 
  AND token = '+hp6VVsx58vxnp4Sj23ljkcKKlGCITMLHwTzcNAoB3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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