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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '013fb325321bc76c23c84f0dec99d7b7265b973b3d32d65d389ef714ded46699' 
  AND token = 'CPuhY1mFBETNSmkTTHBKNZkpYonBCFUR7LFNcta/05Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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