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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c9472ef9d74ed60f59209a3f52b4bec6b1a23af6170857823ff4964a2ea824d' 
  AND token = 'VvmBxfvaj7NGqijuxO29fP5P81q4UiiPFQHsRASrDrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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