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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '139d73f660839d1dd217311928f69da47eb41620afe275a517fb4da2310b1545' 
  AND token = 'yy+JGWzekM52zalkCY4cSvx1/TWq5jxK0SHvq/6QgE0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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