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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13e882bca49dd53d32d1174e6e31ad70c2e42bb44fc3b6a6d8adb989b42310f0' 
  AND token = 'U3/xaD3zxJ6Kyaf/ipD2W/Hk/RwTQlPd7Vb5A5u1dqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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