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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0460c0f0cad0c523bd1af541479b438a6dd543c3cdf184758461eb8baee3e10a' 
  AND token = 'tCq8LRzrkupeZszZivhjtTxIGuZvdGbtzoJvUUSd1l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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