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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39e93af9e1b33a7ccdab56010f761557a32595e03138dc6f7cf3b2bd43a37f59' 
  AND token = '0RKGOwhU0ldQAGdox6mAd5yimh4YXxSCgpIxEggjoR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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