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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1ec632167347c855a37761ffba54596803b3b3bc9f7062fc6be1018139b3f0d' 
  AND token = 'y6vX/Nnf9XiL+C9jQLuH7s08bWaKPr5WsOwlWmuCp10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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