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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dc8be5adeaf927068a7441894369926f057f9f7c75eb356d64ffeafa55093c1' 
  AND token = 'aRrH8FDdXgzuvki/lITgrEjJOyT65jffoEHONdKsIQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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