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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e4b4f452f7fe6e93c6efb8014ffa7937983c3dabe972696a4fbc0164fb35ea7' 
  AND token = '48BOb5uDk83sXZLif4ZhJIMftAvzVHe19iYyuY/SMnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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