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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4132959507977bb44261c2daa23ab4dbe6a0340cdceca4f4ad71c96c0e287638' 
  AND token = 'LYgljtEgc6G+708pQBL8P/+9OA5ZFbA60AfyKe2PQ+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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