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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6cd2d0f275c3cacad4efaa77cd69d60c2370fdd4b6ca60c4b7c33fc2431ab7dc' 
  AND token = 'aMFJ7r34QGndi+IVDJTmh35qv6Dn88sbCvCUM5nQJvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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