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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '305b832868b202ed2962df2b865e510b0ba45b07939109e801fca555c7d9dd05' 
  AND token = 'I4nUPw9c5X2hVKQgoc7H2ddEjCqK0sGZhGTXXifMq1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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