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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbe626c219bffa708f8f9d87bf43434a5cd3abd9bffdfd1358aa552951506a03' 
  AND token = '//81AubHs4RdBK395tSUCOtX6b7SO6T/XI4o7QDqzj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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