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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd10c7bd8ad0a19b15f85bfc474f5f57b19794f5db10b145debfeaa71d23b0e8' 
  AND token = 'mLDoIXMyDv5eBoxXRo2ZYuQ7mNPO5i3lNaFLHSbhyD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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