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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3cd7b6d99551d5be480930e9faac67bea9bc2914cc520c39b51f0791ac3a83e' 
  AND token = 'Uafz+xBFupq+5hVR9yVbtZ6Ka/GsRbNArTY3B0CrfM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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