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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff67079d2adf5109b4472c6267145f265193a9a4be2871ce106b690f512baa0a' 
  AND token = '5dd6RjpOfxD3dznrdMdG4fS1fAgcSugiz5eG4wEahFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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