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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '951fad7f941e24d96db4c22ba57615d2132ee79976bfee0743eaf91a30962df7' 
  AND token = 'byWbvuWwVyk/CIfVlDTPmDJlrkB3nHQJy33nfeatUlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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