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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e65eda4cc082c8342ca4a555c19b5e1d6941723cc83b7a95ac0a40e5bc4f54' 
  AND token = 'h++E8mfsQH/Pq94DVpKtGlKt7OScObMtynf9jJSLsG4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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