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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64d79794f0c583a4d8be096bedff7b29edc8469cb6b8aa9d1777cf74b6f536d7' 
  AND token = 'sR6TsE5PzkANtXa7aFNlIxwOG0EXIreQvmMMSAmQK2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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