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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a060d3c6f9a6a261ee199297ab739db768c44272531dd58bfe731c96e2209f10' 
  AND token = 'K0rXdoHZ1B0PnmoDsBy6uxB2by54TXstr+cAXegsnBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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