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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ce625eb8f68ec21ea05db237b5f0a05af5c71de955f4898ebb1886ca923ae72' 
  AND token = 'illygmvZ3Nj0dDjDLs5YKtXASd0+KDy6RWm8PnI9ye4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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