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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd010ada861e617f69a0322291f4b67f9f60fff4dde372cc9c378ba8a9820fa7e' 
  AND token = '/cQPnyqhT6bHt4LQCVvO7Go+yuQAOdlA7h/D7RpB05o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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