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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82f7c0fa16052b341db9d996b714e696fbf4caf7fd5cb88650d3381bf067706f' 
  AND token = '+l5XEYxb6Nff5wQ7sryuFdBEJLH9h2RKeF46q3HZrdc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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