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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46413e52188fbbbfd5a95c47e273443d7702a9632eb53aadf4982757b2f39978' 
  AND token = '9Xn90vQbOd4sMEa49UFJFVO7XbbmXfCsIJN0naHd87U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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