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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1890a5538e581e7451afc9fbddb9a88e3469d04e0698d04ba25d4ae1f1d20ae' 
  AND token = 'iC+ElNysOrHPB98SEtbwrS5DoOmpziRVWTlFMVTMuP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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