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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc819f5dd49962159deaaeb2764c333f6ad50484fdb5eac7b24ba1b4855af3fd' 
  AND token = '4Jj/ZLOMcf/eXiDkbyTeYgjd6Md87W2zF1Bx8VrblnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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