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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07456b9390b84d1104521d66a26b356adc8a488816b4e73c011da48d550f6018' 
  AND token = 'e61UZSQHwP0NVf6M2ZjD5wj5x1sbTGUu3F/MzOsrNsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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