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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a3168c350222074af58ae2dbb4f4536a18694aa09a8ec5641fe70bcda1fc50' 
  AND token = 'HDXbce/lnKL5XfCKKYbdJ6oFkA60cPNqGjmoZIA92Wk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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