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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b701a0d8e5f9e5625b45572c339a442ddb65d344da902d79b67f8ad19aa4b5' 
  AND token = 'pV1Xkd1HSb2c24Yreh0HjJCwsv51J6q0shiKKWwIopo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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