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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84b84534a289441fe6918b8e34fb95181fc2d75a11b75c003bd6a860d21997ba' 
  AND token = 'rVfqBm6cfBfEJ7u4m3mEfsEDh1/KLZ30zmqWg/Fte18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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