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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f544fd9d51513dfc7ff53d5f0717e714f287aa87a187f7bc4519deba75e24c3' 
  AND token = 'wbxPo9T/n9C3Df0uzsL0KQ2GUwdINhvXN/llhyQ448E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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