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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44a08e9487265873d5729dea17f30f233d411b45c52f4fdbf01f91449b3e934' 
  AND token = 'CTkraXbbP9Xa0AbmS7ihxnBB4yNHehapcq8WgG/7ViI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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