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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd1a0c7a89074266dd912e97f2f5828d7bdf8d38595b27ee950161e9bfc1ee93' 
  AND token = 'GB9qbKHNzetdeSGZcYkuWXOBBpvWimjmzTNbY1k/3PA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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