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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96069b601ced73d6f2018b4514c3ef35b86c6b11b6be362c2d93bd498316520b' 
  AND token = 'yqCOgaCJzo3MBXizMlrhLC6no7mWVTh1UJ95LlzyqmE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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