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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddc8bab785deff784191e2bd641f627a9ae368aa188c1b6e97c570d96715eb71' 
  AND token = '9mcmmdVy2aKeyzzQPayNMxfspRMqrAspsCc8PNXsk2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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