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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8499ad09a84d7f0b2801b5b69b629f34b8ab00d9ded3c6fe5fce86fe84a113b1' 
  AND token = 'yl6HuNmYaypaHzB3uk+az2MycH/UwZZ62tDTFeMJuvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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