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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6a2baa847034702d508b50e590f8cc89569633d9c5ac54209483e4df7647996' 
  AND token = 'TBYATWT7QxslFDcKlAAwZ4otMvQks15fGZyQYSjdY+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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