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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79631748f43743963f5be0909be562b89e48210252608ef91b50d0282a44ef8f' 
  AND token = 'O0Z4TxQuqUXS28PRKDpx6DweLHBiwFLdQ6frNF3PTDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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