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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '779a4e903fc24399e1c6e58e38e2b77ddabf96f090f1ef216251ece9492ec3a9' 
  AND token = 'CGADqkW8dLEdnicrCtf6BCopFnxzy1X44Cz6RUVaVNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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