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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb80326b53aa4727a80d4f60a418be16d1ffc5511eea762dee069b06e59f6137' 
  AND token = 'm6UhV2sZCGSMoygYjvegUyLD8TmpmK05KY7QPGim4W0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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