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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8850295217f915bacc0ec39f619ad95ab21505e0b7d9b499a6ed0781d70fe2d' 
  AND token = 'kn5NlPRks9MEZa9meK3dCM7PC99/Gtv4S4/+D9uBINo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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