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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58c05e37147c6a3f75298d56772eb6cba93f29bcf4d8aa6360739fe7de9f3a5' 
  AND token = 'ALILWi5N8WElAX4SKg9IjxZxyv/7AJzgTVdBa89gnf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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