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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a407fe3e897d445b979b83a37cffe36d835d5f04528d1250c143c49c26ee77d' 
  AND token = '2mmBpo4uwiiOaU3Qopw6b93xRtn/M6tpRElTvVDFvSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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