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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '275aedc7d4ea6c2b9ac903d4b3a8f3985e968557dc2ff90d388e21841a0ecdc6' 
  AND token = 'NqtrdeCc3lzlEerZRCu0IMmRxXt31eNM5bdO+TTYK7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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