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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba4db13dc01f12b5d72670e33da842cf2c10ffe12a286c05cbaed3be3742a964' 
  AND token = 'yH9o/z+nOdDg6apizSRx/ExnBEVan6gCRE3eD1GeSs0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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