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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d055e029b604db64873a8f8291ed1129cd3b8ca5d45871797694547ba12914f' 
  AND token = 'sScIV7rDjSNOpF2kgBy9EJhkfKZBEmHsyDN8iW/pOAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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