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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932c9c68b8ede5c077005872115329950fe892658a55b2c6fec0077c1748df3b' 
  AND token = 'BJem0IMXJ7sTnlq2Sb95Wde+Kba5pjY07J6TBLusqSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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