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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd63e2caae93381c1b712e21664486504ab4516c5e91ea9868470e4ddd13a67f' 
  AND token = 'Z15joCqb4LCGU6mWF9loj24kFHAarSNNivyRwV+T6a4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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