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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2705be3b71592c940050451e1f6f30c2b0944e89f18ff078b95137cf0891ca3' 
  AND token = 'MWHt+7xPg0LvYWOjKTUrLEItReEd6CgihhzPI/ehFm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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