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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fd62b8baeb73789fe1eae05e96da142473fbc92133e7186605a844e2e9085a0' 
  AND token = 'Z/0bj3dhMyX+aoEE8gEQgIJqSw2k6x2XVLLmO0/7XDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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